Undercuts and sidecuts have always been associated with the punk, metal and gothic underground scene but now undercut hair styles are almost part of the norm. Shaved patches of hair add an extra accent to hair styles, especially when the hair is long. Surprisingly, although some think that this hairstyle is a very masculine look it actually emphasises the feminine appeal.
Although this trend looks very simple and achievable I would definitely suggest leaving it to a hair stylist at first. You can maintain it yourself thereafter with a good hair trimmer.
Here are some of my favourite undercut looks: